Okay, I've alluded to Susan Kleiner's "Power Eating" on here multiple times, but in the past I've been too lazy to quote it in depth. Chapter 7 of the book is entitled "Muscle Building Products" and discusses at length a number of the current generation of sports supplements (by no means a complete list). She categorizes the supplements into four lists: 1) Definitely Worth It 2) Possibly Useful 3) Wasting Your Time 4) Potentially Harmful I won't reproduce the entire chapter with explications of the usefulness of each supplement, but I will post the chart. The book's publication date was 2001. DEFINITELY WORTH IT Carbohydrate/Protein Sports Drinks Creatine Weight Gain Powders Glucose-electrolyte solutions Caffeine POSSIBLY USEFUL BCAA's Carnitine CoEnzyme Q10 Glucosamine/Chondroitin Sulfate Glutamine Glycerol HMB MCT Oil Protein Supplements Ribose Taurine Zinc-Magnesium WASTING YOUR TIME CLA Inosine Pyruvate Tryptophan POTENTIALLY HARMFUL Amino Acids Bee Pollen DHEA DMG GBL Plant Sterols *EDIT*: Amino Acids and Bee Pollen belong in the "Potentially Harmful" category. Sorry, my mistake.